SimpleXMLElement::addChild

(PHP 5 >= 5.1.3)

SimpleXMLElement::addChild — Adds a child element to the XML node

说明

public SimpleXMLElement SimpleXMLElement::addChild ( string $name [, string $value [, string $namespace ]] )

Adds a child element to the node and returns a SimpleXMLElement of the child.

参数

name: The name of the child element to add.
value: If specified, the value of the child element.
namespace: If specified, the namespace to which the child element belongs.

返回值

The addChild method returns a SimpleXMLElement object representing the child added to the XML node.

范例

Note:

Listed examples may include example.php, which refers to the XML string found in the first example of the basic usage guide.

Example #1 Add attributes and children to a SimpleXML element

  <?php

 include  'example.php' ;

 $sxe  = new  SimpleXMLElement ( $xmlstr );
 $sxe -> addAttribute ( 'type' ,  'documentary' );

 $movie  =  $sxe -> addChild ( 'movie' );
 $movie -> addChild ( 'title' ,  'PHP2: More Parser Stories' );
 $movie -> addChild ( 'plot' ,  'This is all about the people who make it work.' );

 $characters  =  $movie -> addChild ( 'characters' );
 $character   =  $characters -> addChild ( 'character' );
 $character -> addChild ( 'name' ,  'Mr. Parser' );
 $character -> addChild ( 'actor' ,  'John Doe' );

 $rating  =  $movie -> addChild ( 'rating' ,  '5' );
 $rating -> addAttribute ( 'type' ,  'stars' );
 
echo  $sxe -> asXML ();

 ?>

以上例程的输出类似于：

<?xml version="1.0" standalone="yes"?>
<movies type="documentary">
 <movie>
  <title>PHP: Behind the Parser</title>
  <characters>
   <character>
    <name>Ms. Coder</name>
    <actor>Onlivia Actora</actor>
   </character>
   <character>
    <name>Mr. Coder</name>
    <actor>El Act&#xD3;r</actor>
   </character>
  </characters>
  <plot>
   So, this language. It's like, a programming language. Or is it a
   scripting language? All is revealed in this thrilling horror spoof
   of a documentary.
  </plot>
  <great-lines>
   <line>PHP solves all my web problems</line>
  </great-lines>
  <rating type="thumbs">7</rating>
  <rating type="stars">5</rating>
 </movie>
 <movie>
  <title>PHP2: More Parser Stories</title>
  <plot>This is all about the people who make it work.</plot>
  <characters>
   <character>
    <name>Mr. Parser</name>
    <actor>John Doe</actor>
   </character>
  </characters>
  <rating type="stars">5</rating>
 </movie>
</movies>

参见

SimpleXMLElement::addAttribute() - Adds an attribute to the SimpleXML element
Basic SimpleXML usage

用户评论:

[#1] johninen at gmail dot com [2015-09-14 13:27:35]

In the docs for google sitemaps it is required an element for mobile sitemaps that looks like this: <mobile:mobile/>

I used some time to figure out how to make it, but it is quite simple when understood.

$mobile_schema = 'http://www.google.com/schemas/sitemap-mobile/1.0';

//Create root element
$xml_mobile = new SimpleXMLElement('
<?phpxml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:mobile="'.$mobile_schema.'"></urlset>
');

//Add required children
$url_mobile = $xml_b_list_mobile->addChild('url');
$url_mobile->addChild('loc', 'your-mobile-site-url');
$url_mobile->addChild('mobile:mobile', null, $mobile_schema);

For this to work properly the attribute xmlns:mobile must be set in the root node, and then used as namespace(third argument) when creating the mobile:mobile child with null as value.

[#2] thallisphp at gmail dot com [2014-05-07 19:35:29]

<?php class MySimpleXMLElement extends SimpleXMLElement { public function appendXML($append) { if ($append) { if (strlen(trim((string)$append)) == 0) { $xml = $this->addChild($append->getName()); } else { $xml = $this->addChild($append->getName(), (string)$append); } foreach ($append->children() as $child) { $xml->appendXML($child); } foreach ($append->attributes() as $n => $v) { $xml->addAttribute($n, $v); } } } } ?>

[#3] frosty dot z at freesbee dot fr [2013-05-16 14:31:20]

To complete Volker Grabsch's comment, stating :
"Note that although addChild() escapes "<" and ">", it does not escape the ampersand "&"."

To work around that problem, you can use direct property assignment such as :

<?php $xmlelement->value = 'my value < > &'; // results in <value>my value < > &</value> ?>

instead of doing :

<?php $xmlelement->addChild('value', 'my value < > &'); // results in <value>my value < > &</value> (invalid XML) ?>

See also: http://stackoverflow.com/questions/552957 (Rationale behind SimpleXMLElement's handling of text values in addChild and addAttribute)

HTH

[#4] passerbyxp at gmail dot com [2013-03-27 03:59:47]

Be aware that simply because you can <?php $dom->addChild();?> doesn't mean your XML is valid under simple XML itself:

<?php $dom=simplexml_load_string("<test></test>"); $dom->addChild("3D","1,2,3"); $xml=$dom->asXML(); echo $xml; $dom=simplexml_load_string($xml); ?> Same in PHP 5.3 and 5.4

[#5] ivan dot kakurov at gmail dot com [2013-01-13 04:09:13]

Here's my solution for creating XML from Multidimensional Array.
<?php //DATA $xmlDAta = array( array( "name" => "nameVal", "value" => "valVal", "css" => "cssVal" ), array( "name" => "name1Val", "value" => "val1Val", "css" => "css1Val" ), "tname" => array( array( "iTname" => "iTname", "iTname2" => "iTname1", "iTname2" => "iTname2", "iTbname3" => array( "iiTbname" => "tbName", "iiTbname1" => "tbName1", ), ), ), "tdata" => "otheerDAta" ); function data2XML(array $data, SimpleXMLElement $xml, $child = "items") { foreach($data as $key => $val) { if(is_array($val)) { if(is_numeric($key)) { $node = $xml->addChild($child); $nodes = $node->getName($child); } else { $node = $xml->addChild($key); $nodes = $node->getName($key); } $node->addChild($nodes, self::data2Xml($val, $node)); } else { $xml->addChild($key, $val); } } } //Use $xml = new SimpleXMLElement("<root/>"); Util::data2XML($xmlDAta, $xml, "Items"); ?>

[#6] jerikojerk [2011-07-31 07:32:29]

If you're looking for a way to append children you may be interested in this:

<?php $x = new SimpleXMLElement('<root name="toplevel"></root>'); $f1 = new SimpleXMLElement('<child pos="1">alpha</child>'); $f2 = new SimpleXMLElement('<child pos="2">beta</child>'); $f3 = new SimpleXMLElement('<child pos="3">gamma</child>'); $x->{$f1->getName()} = $f1; $x->{$f2->getName()}[] = $f2; $x->{$f3->getName()}[] = $f3; echo 'count child=',$x->count(),"\n"; echo $x->asXML(); foreach ( $x->children() as $foo ) { var_dump($foo); } ?>

[#7] alex dot feraud at gmail dot com [2011-06-16 02:52:34]

Here is a class with more functions for SimpleXMLElement :

<?php class ExSimpleXMLElement extends SimpleXMLElement { private function addCData($cdata_text) { $node= dom_import_simplexml($this); $no = $node->ownerDocument; $node->appendChild($no->createCDATASection($cdata_text)); } public function addChildCData($name,$cdata_text) { $child = $this->addChild($name); $child->addCData($cdata_text); } public function appendXML($append) { if ($append) { if (strlen(trim((string) $append))==0) { $xml = $this->addChild($append->getName()); foreach($append->children() as $child) { $xml->appendXML($child); } } else { $xml = $this->addChild($append->getName(), (string) $append); } foreach($append->attributes() as $n => $v) { $xml->addAttribute($n, $v); } } } } ?>

[#8] Volker Grabsch [2011-04-21 06:17:22]

Note that although addChild() escapes "<" and ">", it does not escape the ampersand "&".

So addChild() is unsuited to handle user-defined input!

Instead, you will have to replace all "&" with "&" before calling addChild().

Or, use htmlspecialchars() which also replaces other characters, but won't do any harm as addChild() won't replace those again.

[#9] felipenmoura at gmail dot com [2011-04-11 18:06:18]

This method returns a reference to the specific SimpleXMLElement.
If you use:
<?php     $xml= new SimpleXMLElement('<root></root>');     $xml->father['name']= 'Fathers name'; // creates automatically a father tag with attribute name     $son= $xml->father->addChild('son'); // uses the first father tag     $son['name']= 'first son';     $otherSon= $xml->father->addChild('son'); // uses the first father tag but now, in a second son tag     $otherSon['name']= 'second son';          echo htmlentities($xml->asXML()); ?>

The result will be
<root>
    <father>
        <son name='first son' />
        <son name='second son' />
    </father>
</root>

So, once you change something to the just added child, you are actually accessing the element inside the SimpleXMLElement as a reference.